Prospects for the Detection of the Sgr A* Photon Ring with Next-Generation Event Horizon Telescope Polarimetry

Kaitlyn M. Shavelle and Daniel C. M. Palumbo 2024 ApJL 970 L24 A proposed future version of the Event Horizon Telescope may be able to detect the polarization reversal indicative of the presence of a black hole photon ring at a signal-to-noise ratio of 2–3.
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